Published 16 June 2026 by Prop-Pocket Team
Learn how to calculate rental yield properly, including gross and net yield, real cost inputs, common mistakes, and what landlords should compare.
A property that looks profitable on the surface can turn mediocre once the real costs show up. That is exactly why knowing how to calculate rental yield matters. If you are relying on rent in versus mortgage out, you are not measuring performance properly - you are guessing.
Rental yield is one of the quickest ways to assess whether a buy-to-let stacks up, compare one property against another, or spot underperformance in an existing portfolio. But it only becomes useful when you calculate it consistently and with the right inputs.
Rental yield shows the annual rental income a property generates as a percentage of its value or purchase cost. In plain terms, it helps you understand how hard that asset is working.
For landlords, that makes it a practical screening tool. If you are comparing two flats with similar purchase prices but very different rental income, yield helps make the gap obvious. It is also useful when reviewing your current portfolio. A property with a respectable headline rent can still produce a weak yield if the purchase price was too high or running costs have crept up.
That said, yield is not the full story. It does not capture capital growth, financing structure, tax position, void risk over time, or the administrative burden of managing a more complex let. It is a strong starting point, not the whole investment case.
The simplest version is gross rental yield.
Gross rental yield = annual rental income / property value x 100
So if a property brings in £1,250 per month in rent, the annual rental income is £15,000. If the property is worth £250,000, the gross yield is:
£15,000 / £250,000 x 100 = 6%
This is the number you will see most often on listings and quick investment appraisals because it is fast to calculate. It gives you a rough benchmark, but it leaves out the costs that affect actual returns.
For a landlord making real decisions, net yield is the more useful number.
Net rental yield = annual rental income minus annual costs, divided by property value x 100
Using the same property:
Annual rent: £15,000
Annual costs might include:
Letting fees, maintenance, insurance, ground rent, service charge, safety certificates, licence fees where applicable, and an allowance for void periods.
If those total £4,000 per year, the net yield is:
(£15,000 - £4,000) / £250,000 x 100 = 4.4%
That is a very different picture from the 6% gross yield. This is where many landlords go wrong. They compare gross yields when buying, then wonder why the cash performance feels weaker once the property is live.
This depends on what you are trying to measure.
If you are assessing a new purchase, many landlords use total acquisition cost rather than just the agreed purchase price. That means adding stamp duty, legal fees, mortgage fees, survey costs and any immediate works required to get the property let. This gives a more realistic yield based on actual capital deployed.
If you are reviewing a property you already own, you may prefer to use current market value. That helps you understand how the asset is performing today, not just how it performed when you bought it.
Both approaches are valid. The key is consistency. If you use purchase price for one property and market value for another, your comparison becomes less reliable.
When net yield is overstated, the problem is usually not the formula. It is the missing costs.
Maintenance is a common one. Even if a property has had a quiet year, it still makes sense to budget a realistic annual average rather than assume zero. Compliance costs matter too, especially in the UK where gas safety, EICR, EPC requirements and licensing can affect annual ownership cost.
Void periods are another blind spot. A property that rents for £1,000 a month does not produce £12,000 a year if it sits empty for six weeks between tenancies. The same goes for arrears. Contracted rent and collected rent are not always the same thing.
Service charges and ground rent can materially reduce returns on leasehold properties. HMOs can show stronger gross yields, but management intensity, licensing and higher repair frequency often mean net yield tells a more realistic story.
Gross yield is useful when you need speed. It works well for filtering listings, scanning a target area, or making an early judgement on whether a deal is worth deeper analysis.
Net yield is what you use when decisions become serious. It is better for comparing owned properties, checking whether a refinance still makes sense, or understanding whether rent increases are actually improving performance.
In practice, experienced landlords use both. Gross yield helps narrow the field. Net yield helps avoid expensive assumptions.
There is no universal target because yield depends on location, property type, tenant profile and strategy.
A lower-yield property in a stronger capital growth area may still be a sensible long-term hold. A higher-yield property may look attractive on paper but come with more void risk, heavier wear and tear, or more hands-on management. That trade-off matters.
For example, a standard single-let in a strong commuter location might produce a lower gross yield than a northern HMO, but it may also involve fewer compliance layers and less tenant turnover. Better yield is not always better investment quality.
The more useful question is whether the yield is good for that type of asset, in that location, given your financing and management model.
Rental yield is not the same as cash flow.
Yield looks at income relative to property value or cost. It does not directly account for how the deal is financed. Two landlords can own identical properties with identical yields but very different monthly outcomes because one has a low-rate mortgage and the other refinanced at a much higher cost.
That is why yield should sit alongside mortgage analysis, not replace it. If you want a proper view of performance, you also need to track interest, capital repayment, and the wider profit and loss position.
This is where portfolio-level visibility matters. A property can have a decent yield but still become operationally frustrating if missed rent, repair costs or expiring compliance documents are not being monitored closely.
The first is using monthly rent and forgetting to annualise it. The second is ignoring buying costs. The third is relying only on gross yield and treating it as profit.
Another frequent mistake is working from estimated rent instead of achieved rent. If the market supports £1,400 per month but the property has actually let for £1,250, the lower number is the one that belongs in your calculation.
Landlords also sometimes exclude irregular costs because they are not monthly. That weakens the analysis. Boiler replacements, licence renewals and periodic safety work may not happen every month, but they still affect return.
Finally, do not calculate yield once and forget it. Rent changes, interest costs change, service charges rise, and properties age. A yield figure from two years ago is not much use if your cost base has shifted.
If you own more than one property, the challenge is not just calculation - it is consistency and visibility.
Each property should be measured using the same method, with the same definition of annual income and annual costs. Once that is in place, you can compare underperforming assets, identify where rent reviews are overdue, and see which properties are absorbing too much maintenance spend.
This is much harder when information is spread across spreadsheets, bank statements, notes on your phone and old emails from contractors. A central system makes the yield number more trustworthy because the income, repairs, mortgages and compliance costs all sit in one place. For landlords who want tighter control, that matters more than the formula itself.
Say you buy a flat for £180,000.
Your total acquisition costs are £7,000, so your all-in cost is £187,000. The property rents for £950 per month, giving annual rent of £11,400.
Your annual costs are:
Insurance and safety certificates: £450 Service charge and ground rent: £1,800 Maintenance allowance: £900 Voids allowance: £475 Letting and management costs: £1,140
Total annual costs = £4,765
Gross yield based on all-in cost:
£11,400 / £187,000 x 100 = 6.1%
Net yield based on all-in cost:
(£11,400 - £4,765) / £187,000 x 100 = 3.5%
That difference is exactly why disciplined tracking matters. If you only monitor headline rent, the property looks stronger than it really is.
For landlords using software like Prop-Pocket, this gets easier because rental income, mortgage splits, repair costs and recurring compliance items can be tracked together rather than rebuilt by hand every time you want to review performance.
A useful habit is to recalculate yield whenever rent changes, major works are completed, or financing is refinanced. The number is only helpful if it reflects the property you actually own today. That is how yield becomes a decision tool rather than a vanity metric.
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